*{
    margin: 0;
    padding: 0;
}
body{
    height: 100vh;
    display: flex;
    justify-content: center;
    overflow: hidden;
    background: linear-gradient(to bottom, #19778c, #095f88);

}
.container{
    /* 设置视距 */
    perspective: 5px;
    /* 设置3D元素的基点位置 */
    perspective-origin: 50% 50%;
}

.form-box{
    position: fixed;
    text-align: center;
    top: 250px;
    /* width: 100%; */
    height: auto;
    background-color: rgba(255, 255, 255, 0.1);
    width: 400px;
    height: 450px;
    border-radius: 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.5);
    border-left: 1px solid rgba(255, 255, 255, 0.5);
    justify-content: center;
    align-items: center;
    flex-direction: column;
    /* 背景模糊 */
    backdrop-filter: blur(5px);
    /* 阴影 */
    box-shadow: 0 20px 50px rgba(0,0,0,0.5);
}
.form-box .tit{
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    text-transform: uppercase;
    /* 字间距 */
    letter-spacing: 10px;
    text-indent: 10px;
    margin: 90px auto 50px auto;
}
.form-box input{
    width: 300px;
    height: 45px;
    background: transparent;
    text-indent: 8px;
    border: none;
    outline:none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.8);
    color: #fff;
    /* margin: 15px auto; */
}
.form-box input::placeholder{
    color: rgba(255, 255, 255, 0.8);
}
.form-box button{
    width: 300px;
    height: 40px;
    margin: 35px auto 40px auto;
    border:none;
    background: #00addd;
    color: #fff;
    border-radius: 8px;
    letter-spacing: 20px;
    text-indent: 20px;
    font-weight: bold;
    cursor: pointer;
}
.form-box button:hover{
    background: #0098d4;
}
.form-box span{
    font-size: 14px;
    color: #fff;
}
.form-box a{
    color: #00addd;
    text-decoration: none;
}